CN101529505A - Method for making arm for hard disk drive - Google Patents
Method for making arm for hard disk drive Download PDFInfo
- Publication number
- CN101529505A CN101529505A CNA200780028475XA CN200780028475A CN101529505A CN 101529505 A CN101529505 A CN 101529505A CN A200780028475X A CNA200780028475X A CN A200780028475XA CN 200780028475 A CN200780028475 A CN 200780028475A CN 101529505 A CN101529505 A CN 101529505A
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- China
- Prior art keywords
- support arm
- stripeds
- described support
- width
- length
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/4806—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives
- G11B5/4833—Structure of the arm assembly, e.g. load beams, flexures, parts of the arm adapted for controlling vertical force on the head
Landscapes
- Supporting Of Heads In Record-Carrier Devices (AREA)
- Moving Of Heads (AREA)
- Holding Or Fastening Of Disk On Rotational Shaft (AREA)
Abstract
A mounting arm (15) for a hard disk drive has a generally planar region, the mounting arm has at least one striation (17) formed on the generally planar region to provide compressive residual stress with desirable shape characteristics in the mounting arm.
Description
Background of invention
Technical field
Present invention relates in general to the support arm of hard disk drive.Particularly, the present invention relates to have the support arm of hard disk drive of the striped of offsetting residual pressure and the method for making this support arm.
Background technology
The critical component of any computer system is the device of storage data.The common site that is used to store mass data in computer system is at hard disk drive (HDD).The disc driver meat and potatoes is: the disk that is rotated; Support arm, actuator arm for example, it moves to a plurality of positions on the CD with converter; And be used for to the disk write data and from the circuit of disk read data.Current have multiple disc driver to be used, as hard disk drive, and compressed drive, floppy disk.All drivers all adopt rotation or linear support arm.
In hard disk drive, magnetic head reads and writes data on the spinning disk surface, and these disks all coaxially are installed on the spindle motor." position " of being write by magnetic of information is positioned on the circular concentric " magnetic track " on the magnetic disk surface.The necessary fast rotational of disk, thus the position that the computer user needn't be moved under the magnetic head for " position " of information required on the magnetic disk surface waits as long for.In modern disk drives, data bit and magnetic track must be very narrow and very near at interval, to reach the high density information of every magnetic disk surface unit area.
Needed small size and information bit on the magnetic disk surface near at interval in the design of disk drive equipment and mechanical part thereof, producing consequence.Wherein most important consequence is that the magnetic transducer on the magnetic head must be operated near the magnetic surface of disk very much.Have relative motion because thereby disk rotation and magnetic head drive to make between magnetic disk surface and the magnetic head, so Continuous Contact may cause the friction of interface to be failed between magnetic head and the disk.This friction failure, known popular saying is exactly " head crash ", may damage disk and magnetic head, and often causes loss of data.Therefore, magnetic head is designed to be supported by extremely thin air bearing hydrodynamic force ground, thereby when the contact of the physics between magnetic head and the disk was minimized or is avoided, its magnetic transducer can be very closely to disk operating.Generally, during the running of new-type hard disk drive, magnetic head is very little at interval to disk, measures with tens nanometer.
Support arm is normally used for moving and the very approaching magnetic transducer of disk.Must there be enough strong hardness to bear accelerating force, vibration and physical shock in disc driver generation in service.Fig. 1 illustrates the support arm 10 of prior art.Support arm 10 comprises the general plane zone 11 with opening 12, and opening 12 is used to insert the trunnion bearing box.It has bracketed part 13, and bracketed part 13 is connected at least one cantilever (not shown) at far-end by laser bonding by main aperture 14.Being connected on the cantilever is write head/slide block, and this write head/slide block comprises the magnetic transducer on the surface of magnetization disk (not shown).Support arm 10 can carry two cantilevers supporting two converter head in an opposite direction on two face, one upward to a downward direction.Normally, support arm 10 has about 1.4 inches length 20, about 0.20 inch width 16, and about 0.012 inch thickness.Support arm 10 can be made by for example 300 series stainless steel materials.
The deviser must consider to be used for to move the characteristic with the support arm of the very approaching magnetic transducer of disk, so that in response to the minimum vibration of angular motion and other excitation fast.For example, support arm must be enough hard and fulcrum roller that installed must have sufficiently high quality so that in operating process, the position of magnetic head can accurately be controlled.In addition, the interface between support arm and the trunnion bearing must have sufficient rigidity and intensity, makes its control head position accurately during operation, and necessary boundary condition is provided, so that the higher natural reonant frequency of support arm vibration.The hardness of support arm also must be sufficient to restriction deflection, and this deflection may cause contacting disk in the incident of physical shock.
Support arm is normally made by fully hard 300 series stainless steel bands.Stainless steel is evened up, to alleviate any unusual in the surplus pressure in material, to produce flat punching press optimal state.Irrelevant with new life's stress state, the result who cuts irregular periphery from raw material produces the given shape that very lacks ideal form.Therefore, casting forming is used to offset side cut back shape and increases any desired shapes.
For to fully hard stainless steel acting force to obtain desired shapes, need overbend.This overbend needs shaping processing, and it is difficult to make, the cost costliness, and only is applicable to given raw material lot.In case new material changes, needed punch shape will be different to compensate this variation.This needs frequent replacing instrument, and its cost is very high.
The manufacturing of most of state-of-the arts attempts to improve the newborn residual stress condition of raw material, and this has obtained limited short-term success.Normally used traditional EDM forming punch has obtained limited short-term success in the industry.Also attempted optimizing cutting gap and made minimizing deformation by punching press.Also attempted optimum shape coupling with punch shape and supposition.All these manufacture methods all can not realize changing the shape of the support arm with little change, perhaps do not possess fast and easily adjust the ability of manufacture method.
Therefore, need to have the support arm of improved residual stress condition in the prior art, this easily is applied to support arm by being provided with the localized compressive residual stress district, to adjust the shape of support arm.
Summary of the invention
Have the support arm that improves residual stress, is used for hard disk drive, this support arm has the general plane zone, and striped is formed in the plane domain being that localized compressive residual stress provides desirable shape characteristics in support arm.Can form striped by the drift that has sawtooth to the support arm effect.Striped can be parallel to the width or the length arrangement of described support arm, perhaps intersects with the length of described support arm and arranges sideling.They can be whole or in part form along the width of support arm or length.Striped can be formed on two faces of support arm.They may be loosely or closely at interval.Each striped can have the different depth that has different compressive strength.Striped can be used for controlling the shape of support arm.
Description of drawings
Consider that below in conjunction with the description of the drawings exact nature of the present invention and target thereof and advantage will become apparent, wherein,, identical Reference numeral is represented identical part in whole accompanying drawings.Wherein:
Fig. 1 is the vertical view of prior art support arm.
Fig. 2 is the vertical view according to support arm of the present invention.
Fig. 3 illustrates the precompressed figure of the support arm with the deflection that is brought by physical shock.
Fig. 4 illustrates according to of the present invention, schemes after having the pressure of support arm of compressive region one.
Fig. 5 illustrates the precompressed figure of the support arm with the deflection of S shape.
Fig. 6 illustrates according to of the present invention, schemes after the pressure of the support arm that all has compressive region on two faces.
Fig. 7 illustrates the precompressed figure of the support arm that does not have deflection or distortion.
Fig. 8 illustrates according to of the present invention, schemes after having the pressure of support arm of desirable flexural property.
Fig. 9 illustrates the compressive region figure according to the different pressures intensity on the support arm of the present invention.
Figure 10 is the vertical view according to support arm of the present invention.
Figure 11 is the vertical view according to support arm of the present invention.
Figure 12 is the vertical view that illustrates according to the support arm of the compressive region on two faces of support arm of the present invention.
Figure 13 is the upward view according to the support arm of the compressive region on two faces that illustrate support arm of the present invention.
Figure 14 is the vertical view that has the support arm of the variable gap between the compressive region.
Figure 15 is the vertical view of support arm with compressive region of partial width and/or length.
Embodiment
Because punching press and raw-material influence, the support arm configurations that is produced seldom is desirable.This is to discharge owing to the pressure that acts in cutting process with from the residual stress that cuts.For offsetting bad shape, the local compression stressed zone is formed on the support arm, thereby adjusts the shape of support arm.
Fig. 2 illustrates the support arm 15 with compressive region 17, and this compressive region 17 is parallel to the width of support arm 15 and arranges.
Under the situation on the flat punch, the drift that utilizes controlled force and/or substitute to have sawtooth can be depressed in the above at support arm 15.Sawtooth on the drift has crest, and this crest applies enough pressure and pulling force to cause plastic yield to the material of support arm.This causes forming the compressive region 17 with depression or striped along the sawtooth of drift.Preferably about 20 μ in that cave in are dark, and variable width and length can be arranged.As shown in Figure 2, to pass that support arm 15 forms maybe can be a plurality of depression points 18 along straight line or curved path to compressive region 17.Form depression points 18 by a plurality of jagged crest on the drift.
From the depression and the compressive residual stress of its manufacturing, make support arm 15 to leaving the bending of sawtooth place.Fig. 2 illustrates a plurality of compressive regions 17 that formed by corresponding a plurality of sawtooth on the drift.The quantity of compressive region 17, direction and spacing depend on the configuration of the sawtooth of drift.Sawtooth can be configured to have Any shape or height.The drift that has a sawtooth can be pressed against on the support arm 15 to produce dark depression, and next polished to change height in the sawtooth top, and this can once finish, with the deflection that obtains to cause along the pressurized of the difference amount of the length of support arm 15 or width.This eliminates the needs that the coupling drift is set for relative face.Perhaps, as Fig. 6, shown in 8,12 and 13, sawtooth can be used on the drift of any one side.
The specific location that different configurations and direction are used on the support arm is provided with needed compressive region.For example, Fig. 3 and 4 illustrates state behind the pre-pressurized of the support arm 21 of the compressive region 19 that has on the concave surface and pressurized.Fig. 3 is the enlarged drawing of support arm 21, and applied pressure produces deflection or crooked in the release of the residual stress that produces how to hold itself out to be because by cutting and the cutting.Fig. 4 illustrates that compressive region 19 on support arm 21 one side is to offset bad shape.A plurality of sawtooth can be used for producing along the bending of support arm 21 to offset on back pressurized support arm 21 bending in the opposite direction.Therefore, support arm 21 suitably shapings of quilt, and keep its structural strength and integrality.
Fig. 5 and Fig. 6 illustrate behind the pre-pressurized and pressurized of the support arm 23 that has compressive region on two faces.Fig. 5 is the enlarged drawing of support arm 23, its owing to the release of the residual stress that produces by cutting and in cutting applied pressure have deflection of S shape or bending.Compressive region 27 on below compressive region 25 on Fig. 6 illustrates above the support arm 23 and the support arm 23, it offsets bad shape.Have the compressive region 25 of ad-hoc location and the distortion that 27 support arm 23 has been corrected S shape.
When compressive region can be used for offsetting bad shape by the plastic yield of reinventing support arm, compressive region also can be used to dispose the support arm with desirable shape characteristics.For example, after Fig. 7 and Fig. 8 illustrate the pre-pressurized and pressurized of the support arm 29 with desirable shape characteristics.Fig. 7 has described the support arm 29 with initial plane shape.Fig. 8 illustrates that compressive region 31 and 33 parts are formed on the relative face of support arm 29 shape with control support arm 29.This causes the support arm 29 that 35 places have the ideal structure characteristic in the end.
Fig. 9 illustrates compressive region 37 with different pressurized degree of depth and 39 support arm 41.Therefore, support arm 41 is morely crooked in some zones 37 than in other zone 39, and keeps its structural strength and integrality in operation.
The quantity of compressive region, direction and spacing will depend on the characteristic of localized compressive residual stress in the support arm.For example, as shown in Figure 2, support arm 15 has compressive region 17, and it is parallel to the width of support arm 15.Figure 10 illustrates the support arm 43 with compressive region 45, and compressive region is parallel to the length of support arm 43.Figure 11 illustrates compressive region 49,51 with a plurality of directions and 53 support arm 47.In Figure 11, compressive region 49 is parallel to the width of support arm 47, and compressive region 51 and 53 intersects with the length of support arm 47 sideling.Oblique compressive region 51 and 53 is the pillars that are used to provide support arm 47, so that the support arm 47 that increase hardness and/or configuration have the ideal structure characteristic.
Figure 12 and 13 illustrates the compressive region of use on 55 two faces of support arm.Compressive region can all or part ofly be formed on the support arm 55.In addition, compressive region can be formed on the relative face of support arm 55, thereby the compressive region on relative face is not arranged.Figure 12 shows the compressive region 57 that partly is formed at support arm 55 upper surfaces along the whole length of support arm.Figure 13 illustrates part and is formed at the compressive region 59 of support arm 55 lower surfaces, and does not have compressive region on relative upper surface.
Spacing between the compressive region and quantity depend on the desired shapes characteristic.The compressive region of tight spacing provides bigger flexibility than the compressive region at loose interval.Similarly, the number of compression zones of use is many more, and the compressive residual stress of support arm that is used for disposing the support arm with desirable shape characteristics is just big more.
Figure 14 illustrates the vertical view of the support arm 61 that has variable gap between compressive region.Compressive region 63 is loose intervals, and on the other hand, compressive region 65 is tight spacings, makes the compressive region that is provided with greater number in the zone.Therefore, compressive region 65 provides bigger flexibility than compressive region 63.
Figure 15 illustrates the support arm 67 of the compressive region with partial width and/or length.Support arm 67 can have the compressive region 69 of the partial-length that uses support arm 67, and the compressive region 71 that uses the partial width of support arm 67.This arrangement is by providing extra bending to adjust distortion to support arm 67.
Illustrated and described some embodiment in the accompanying drawing, should be appreciated that, these embodiment just are used to illustrate to have the general plane zone, and a plurality of compressive regions that form on the general plane zone are with the support arm of the hard disk drive that is provided with compressive residual stress on support arm.
Claims (23)
1. method that is used to make the support arm of hard disk drive, the step of this method comprises:
From the stainless steel cut support arm; And
On the plane domain of described support arm, form one or more stripeds, in the part of described support arm, to produce compressive residual stress as required, to change the shape of described support arm.
2. the method for claim 1 wherein forms on the side that step further is included in described support arm and forms described one or more stripeds.
3. the method for claim 1 wherein forms on two sides that step further is included in described support arm and all forms described one or more striped.
4. the method for claim 1 wherein forms step and comprises that further use has the drift of sawtooth to form described one or more striped.
5. method as claimed in claim 4, the wherein said drift that has sawtooth have the sawtooth top that changes height.
6. the method for claim 1, wherein said one or more stripeds are parallel to the width of described support arm.
7. the method for claim 1, wherein said one or more stripeds are parallel to the length of described support arm.
8. the method for claim 1, wherein said one or more stripeds are oblique with respect to the length of described support arm.
9. the method for claim 1, wherein said one or more stripe-shaped become along the depression points of the length of described support arm.
10. the method for claim 1, wherein said one or more stripe-shaped become along the depression points of the width of described support arm.
11. support arm that is used for hard disk drive, comprise the general plane zone that forms by stainless steel, described plane domain has the one or more stripeds on this plane domain, to produce compressive residual stress as required in the part of described support arm, with shape or the hardness of changing described support arm.
12. support arm as claimed in claim 11, wherein said one or more stripeds are parallel to the width of described support arm.
13. support arm as claimed in claim 11, wherein said one or more stripeds are parallel to the length of described support arm.
14. support arm as claimed in claim 11, wherein said one or more stripeds are oblique with respect to the length of described support arm.
15. support arm as claimed in claim 11, the width that wherein said one or more stripe-shaped become with respect to described support arm is oblique.
16. support arm as claimed in claim 11, wherein said one or more stripe-shaped become along the depression points of the width of described support arm.
17. support arm as claimed in claim 11, wherein said one or more stripeds are formed on two sides of described support arm.
18. support arm as claimed in claim 11, wherein said one or more stripeds have the different degree of depth.
19. support arm as claimed in claim 11, wherein said one or more stripeds are spaced apart loosely.
20. support arm as claimed in claim 11, wherein said one or more stripeds are closely spaced apart.
21. support arm as claimed in claim 11, wherein said one or more stripeds are the depression points on the described support arm.
22. support arm as claimed in claim 11, wherein said one or more stripeds partly form along the length of described support arm.
23. support arm as claimed in claim 11, wherein said one or more stripeds form along the width segments ground of described support arm.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/493,965 | 2006-07-27 | ||
| US11/493,965 US7623320B2 (en) | 2006-07-27 | 2006-07-27 | Discrete mounting arm for hard disk drive and method for making the same |
| PCT/US2007/074243 WO2008014274A2 (en) | 2006-07-27 | 2007-07-24 | A method for making a mounting arm for a hard disk drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101529505A true CN101529505A (en) | 2009-09-09 |
| CN101529505B CN101529505B (en) | 2011-09-14 |
Family
ID=38982270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200780028475XA Active CN101529505B (en) | 2006-07-27 | 2007-07-24 | Method for making arm for hard disk drive |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7623320B2 (en) |
| JP (1) | JP5047286B2 (en) |
| CN (1) | CN101529505B (en) |
| WO (1) | WO2008014274A2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9361917B2 (en) | 2011-07-19 | 2016-06-07 | Intri-Plex Technologies, Inc. | Method to fabricate a base plate for piezo actuation |
| US10796727B1 (en) | 2019-05-08 | 2020-10-06 | Seagate Technology Llc | Using solid state deposition in the manufacture of data storage devices, and related devices and components thereof |
| US11017819B1 (en) | 2019-05-08 | 2021-05-25 | Seagate Technology Llc | Data storage devices, and related components and methods of making |
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| US3677111A (en) | 1970-12-03 | 1972-07-18 | Corrugated Finishing Products | Method for producing cutting rules |
| JPS6054238A (en) * | 1983-09-02 | 1985-03-28 | Fuji Valve Kk | Plane working method of forming plate material |
| JPH0231389A (en) * | 1988-07-21 | 1990-02-01 | Mitsubishi Electric Corp | Fixed magnetic disk device |
| JPH0734547Y2 (en) * | 1989-12-07 | 1995-08-02 | アルプス電気株式会社 | Magnetic head support mechanism |
| JPH0447570A (en) * | 1990-06-15 | 1992-02-17 | Hitachi Ltd | Carriage structure for magnetic disk device |
| US5408372A (en) * | 1990-09-07 | 1995-04-18 | Karam, Ii; Raymond M. | Transducer suspension damping via microstiffening |
| JPH07274470A (en) * | 1994-03-28 | 1995-10-20 | Nippon Petrochem Co Ltd | Manufacture of actuator disc device |
| US6519115B1 (en) * | 1994-10-21 | 2003-02-11 | Seagate Technology Llc | Low wear, low friction ramp method and apparatus for a disc drive system |
| JP2682472B2 (en) * | 1994-10-31 | 1997-11-26 | 日本電気株式会社 | Magnetic head and manufacturing method thereof |
| US5588200A (en) | 1995-05-15 | 1996-12-31 | K. R. Precision Public Company Limited | Tightened distribution of magnetic-head suspension-assembly static roll by infrared stress relief |
| US5677815A (en) * | 1995-10-27 | 1997-10-14 | Chan; Hon Po | Support arm for use in an actuator assembly of a digital storage system with the support arm being formed from a polymer and including a grounding conductor |
| JP2848340B2 (en) * | 1996-07-11 | 1999-01-20 | 日本電気株式会社 | Magnetic disk drive |
| US5812342A (en) * | 1996-11-27 | 1998-09-22 | Magnecomp Corporation | Reduced mass load beam with improved stiffness properties |
| US6091578A (en) * | 1997-08-15 | 2000-07-18 | Questek Innovations, Inc. | Disk drive actuator components made of composite material including fibers |
| DE19833388C2 (en) * | 1998-07-24 | 2003-05-15 | Ibm | Process for the targeted influencing of the vibrations of fine or micromechanical carrier systems |
| US6663817B1 (en) | 1999-03-26 | 2003-12-16 | Hitachi Global Storage Technologies Netherlands, B.V. | Method for manufacture of sliders |
| US6751068B1 (en) * | 2000-10-24 | 2004-06-15 | Seagate Technology Llc | Actuator assembly for a disc drive having shell extensions |
| US6801405B2 (en) * | 2000-10-25 | 2004-10-05 | Seagate Technology Llc | Unibody (monocoque) arm design for high performance disc drives |
| AU2002231321A1 (en) * | 2000-10-25 | 2002-05-06 | Seagate Technology Llc | Monocoque head suspension |
| US6545842B2 (en) * | 2001-01-19 | 2003-04-08 | Seagate Technology Llc | Disc drive actuator assembly drag reduction features |
| JP4267841B2 (en) * | 2001-05-30 | 2009-05-27 | 富士通株式会社 | Head arm of magnetic disk drive |
| JP4034789B2 (en) * | 2005-03-18 | 2008-01-16 | 株式会社東芝 | Disk drive device |
| US7430097B2 (en) * | 2005-06-29 | 2008-09-30 | Seagate Technology Llc | Actuator with fluid-redirecting and drag-reducing surface features |
-
2006
- 2006-07-27 US US11/493,965 patent/US7623320B2/en active Active
-
2007
- 2007-07-24 WO PCT/US2007/074243 patent/WO2008014274A2/en active Application Filing
- 2007-07-24 CN CN200780028475XA patent/CN101529505B/en active Active
- 2007-07-24 JP JP2009521956A patent/JP5047286B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2009545099A (en) | 2009-12-17 |
| WO2008014274A3 (en) | 2008-11-06 |
| CN101529505B (en) | 2011-09-14 |
| WO2008014274A2 (en) | 2008-01-31 |
| US7623320B2 (en) | 2009-11-24 |
| JP5047286B2 (en) | 2012-10-10 |
| US20080024931A1 (en) | 2008-01-31 |
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